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Switch operable under a predetermined condition, external magnetic field generating unit, combination of such a switch and an external magnetic field generating unit and electronic apparatus incorporating the same

Inactive Publication Date: 2005-12-06
TAKAMISAWA ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]It is another and more specific object of the present invention to provide a switch operable under a pred

Problems solved by technology

Therefore, there is a problem in using the above-described switch 10 as a switch operable under a predetermined condition.

Method used

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  • Switch operable under a predetermined condition, external magnetic field generating unit, combination of such a switch and an external magnetic field generating unit and electronic apparatus incorporating the same
  • Switch operable under a predetermined condition, external magnetic field generating unit, combination of such a switch and an external magnetic field generating unit and electronic apparatus incorporating the same
  • Switch operable under a predetermined condition, external magnetic field generating unit, combination of such a switch and an external magnetic field generating unit and electronic apparatus incorporating the same

Examples

Experimental program
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Effect test

first embodiment

[0061]FIGS. 2 and 3 are diagrams showing a switch 20 operable under a predetermined condition of the present invention. FIGS. 4A and 4B are schematic diagrams showing a structure of the switch 20. The switch 20 of the present embodiment and switches of other embodiments are all based on reed switches and are types of proximity switches.

[0062]As shown in FIGS. 2, 3 and 4A, the switch 20 includes a base 23, a first switch part 21 and a second switch part 22. The first and second switch parts 21 and 22 are supported by the base 23 and are aligned on a straight line 24. The first and second switch parts 22 and 23 are separated by a dimension along the straight line 24 and are connected in series via a connecting member 25 that is electrically conductive and non-magnetic. All elements of the switch 20 are covered with a cover 26 except for terminal parts 27b and 30b provided on either end of the switch 20. The terminal parts 27b and 30b are provided for mounting the switch 20 on a printe...

second embodiment

[0083]FIGS. 5 and 6 are diagrams showing a switch 20A operable under a predetermined condition of the present invention. FIGS. 7A and 7B are schematic diagrams showing a structure of the switch 20A.

[0084]The switch 20A is similar to the switch 20 shown in FIGS. 2 through 4 except that pole pieces 51 through 54 are additionally provided as access parts for magnetic fluxes. In FIGS. 5, 6, 7A and 7B, elements corresponding to elements shown in FIGS. 2, 3, and 4 are indicated by the same reference numerals and detailed description is omitted. The operational condition of the switch 20A is restricted to a case where there are two magnets and that positions and sizes of the two magnets are predetermined.

[0085]The pole pieces 51, 52, 53 and 54 are attached to the bent part 27a of the reed piece 27, the base part 28a of the reed piece 28, the bent part 30a of the reed piece 30 and the base part 31a of the reed piece 31, respectively.

[0086]The cover 26A is provided with openings 26Aa at posi...

third embodiment

[0092]FIG. 8 is a diagram showing a switch 70 operable under a predetermined condition of the present invention. FIGS. 9A through 9C are schematic diagrams showing a structure of the switch 70.

[0093]The switch 70 operates only under a condition where there is one magnet with magnetic poles being in a particular orientation.

[0094]As shown in FIGS. 8 and 9A, the switch 70 includes a base 71, a yoke-magnet assembly 72 and a switch part 73. The yoke-magnet assembly 72 and the switch part 73 are supported by the base 71. All the elements of the switch 70 are covered with a cover 74 except for terminal parts 75c and 76c provided at both ends of the switch 70 for mounting the switch 70 on a PCB.

[0095]The switch part 73 includes a reed piece 75 having a crank shape and a reed piece 76 also having a crank shape. Bent parts of the reed pieces 75 and 76 are attached to the base 71. A gap 79 exists between a contact part 75b at the tip of a horizontal reed part 75a and a contact part 76b at the...

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Abstract

A switch operable under a predetermined condition includes a plurality of switch parts each including a pair of reed pieces and a connecting member of an electrically conductive non-magnetic material via which the plurality of switch parts are serially connected. The switch operates only under a condition where all of the plurality of switch parts are operated by external magnetic fields individually and simultaneously acting on the plurality of switch parts.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a switch operable under a predetermined condition, an external magnetic field generating unit, a combination of such a switch and an external magnetic field generating unit and an electronic apparatus incorporating the same and particularly relates to a switch operable under a predetermined condition that can recognize a predetermined external magnetic field acting thereon and does not operate under a normal external magnetic field but under such a predetermined external magnetic field.[0003]2. Description of the Related Art[0004]Many electric apparatuses have a structure including a main body and an attachment to be loaded therein. There are cases where such electric apparatuses require means for recognizing whether the attachment has been properly loaded in the main body. A switch may be used as one of the means for recognizing whether the attachment has been properly loaded in the mai...

Claims

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Application Information

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IPC IPC(8): H01H51/29H01H36/00
CPCH01H36/0046H01H2001/5888
Inventor AOKI, SHIGEMITSUSHIMIZU, NOBUYOSHISASO, HIROFUMIOKAMOTO, YOSHIOMAENO, CHIAKIFUJII, NOBORUSAITO, YASUSHI
Owner TAKAMISAWA ELECTRIC